Ce livre est écrit seulement en anglais. This work presents clinical tools developed starting from the 19th century until today. Four of these tools make it possible to establish a Diagnostic Testing of Axonal Lesions, which in turn reveal undetectable lesions in the cutaneous axons of the whole body. These various clinical tools enable the decrease of the Perception Pressure Threshold and simulaneously the relieving of neuropathic pain syndrome or complex regional pain syndrome.